The principle of three-side sealing bag machine: computer controlled three-side sealing, self-supporting, embossing buckle bag making machine three-side sealing bag making machine This machine adopts PLC microcomputer control, double servo double frequency conversion speed regulation, photoelectric monitoring and correction, pneumatic transmission and other technologies. It integrates machine photoelectricity into one, adopts automatic unwinding, pair cutting, tension adjustment control system, five-row bridge type longitudinal sealing hot stamping and circulating water cooling bonding device, heating temperature Pc control, and can increase various irregularities as needed. Bag assisted bag making device. The whole machine has the characteristics of high degree of automation, good product quality and strong versatility.